Backpack



FIG. 1 is a perspective view of a backpack showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a left side elevational view thereof.

The broken line showing of the word “HAPPY” is included for the purposeof illustrating environmental structure and forms no part of the claimeddesign.

CLAIM The ornamental design for a backpack, as shown and described.